Generic sildenafil: same molecule, different price

What does a generic have to prove?

A generic is not a copy made by guesswork. It has to demonstrate that it delivers a comparable amount of the active ingredient into the bloodstream, over a comparable time course, to the original.

Same active compound. Same strength. Same route.

What can differ: the inactive ingredients holding the tablet together, the colour, the shape, the coating, the name.

So why the price gap? Because developing a new medicine costs an enormous amount, and that cost is recovered during the patent period. Once the patent expires, other manufacturers can produce the same compound without repeating that investment.

The difference is accounting, not chemistry.

Choosing a strength

Sildenafil comes in several strengths, and more is not automatically better.

Most people start in the middle of the range. If the response is good but side effects are troublesome, stepping down often keeps the benefit and loses the headache. If there is no response at all across several properly-conducted attempts, stepping up is reasonable.

"Properly conducted" is doing a lot of work in that sentence. It means: on a relatively empty stomach, with adequate time before, without much alcohol, and with actual arousal involved.

A fair number of people who think a dose is too weak were realy defeated by a large dinner.

How it works, briefly

Arousal triggers nitric oxide release in the erectile tissue, which produces a messenger that relaxes the small arteries. Blood flows in and the engorged tissue compresses the veins that would drain it.

An enzyme called PDE5 destroys that messenger, ending the erection.

Sildenafil blocks PDE5. The messenger lasts longer.

Which is why arousal is not optional. Nothing is being switched on — something is being prevented from switching off.

Timing and the meal rule

• About an hour before.
• Avoid a heavy, fatty meal beforehand.
• Once per twenty-four hours, maximum.
• Limited alcohol.
• No grapefruit juice.

The meal point is the one that most often explains a disappointing result with this particular molecule.

Nitrates: the one hard stop

This is the single line on the page with no room for interpretation.

Glyceryl trinitrate, isosorbide mononitrate, isosorbide dinitrate, nicorandil — anything taken for angina. Including the spray carried in a pocket for emergencies.

Together they can drop blood pressure to a dangerous level. Not mild dizziness. Circulatory collapse.

The same applies to amyl nitrite used recreationally, sold as poppers. That combination reaches emergency departments more often than anyone admits.

If you take anything in that group, this is out. No exceptions, no leaving a gap, no trying half a tablet.

Other interactions

Alpha blockers for prostate enlargement lower blood pressure too, and the effects combine. That needs arranging deliberately.

Certain antifungals, some antibiotics and several HIV medicines raise sildenafil levels substantially, which usually means a lower dose.

Who should avoid it

• Recent heart attack or stroke
• Unstable angina
• Severe heart failure
• Blood pressure that is uncontrolled in either direction
• Severe liver impairment
• Retinitis pigmentosa
• Prior sudden vision loss from optic nerve ischaemia

Possible side effects

• Headache
• Flushing
• Blocked nose
• Indigestion
• Blue-tinged vision, light sensitivity
• Dizziness
• Back or muscle ache

Two things that need help immediately

An erection lasting more than four hours. This is not something to wait out. After several hours the tissue begins to sustain permanent damage, and the window for treating it closes.

Sudden loss of vision or hearing, in one or both sides. Stop taking it and get seen urgently.

Both are rare. Both are measured in hours rather than days.

It can be an early warning

This part matters more than the tablet does.

The arteries supplying erectile tissue are narrow. Narrowing shows up there before it shows up in the wider coronary arteries — sometimes by several years.

So difficulty that developed gradually over months can be the first visible sign of vascular disease. That makes it an opportunity rather than only a problem: blood pressure, blood sugar and cholesterol are worth checking.

The picture is different if it came on suddenly, happens only in certain situations, and morning erections are still there. That pattern usually points to stress, exhaustion, a relationship, or a medicine you have started.

Ordering without prescription: how it works

Generic pricing is the main reason people buy larger packs rather than a few tablets at a time.

Pick the strength and the pack size, put in a delivery address, confirm. Couple of minutes, any time of day, no queue and no conversation across a counter.

It goes out in plain packaging. No pharmacy name on the outside, nothing that hints at what is inside. How long delivery takes depends on where the parcel is headed.

On price it comes down to strength and pack size. Larger packs generally work out better per unit.

If something arrives damaged anywhere in the UK, send the order number and a photograph the same day. We replace free of charge or refund in pounds. Do not use medication from a damaged blister.

Sources and references

Active ingredient: sildenafil. Sildenafil — MedlinePlus (NIH). Reviewed: 17 September 2026.

Related Products

Free bonus

Avanafil

From: £2.48

Buy

Cialis Original

From: £2.16

Buy

Levitra Original

From: £3.02

Buy

Viagra Original

From: £2.25

Buy